ROC Virtual Tour – Surface

Post are in various states of disrepair, some have been stripped entirely and are little more than a empty concrete room, and others have all manner of different equipment and paperwork in them and some are flooded in excess of four foot deep. Some more have even been fully restored. This page serves to illustrate what an ROC post looks like and what equipment may be found in ROC posts today, or when operational.

NB* ALL ROC Posts are on private land, and the majority are in a dangerous condition, you should only visit them with the owners permission and NEVER on your own. Items found in Posts should NEVER be taken without permission, as that is theft.

Sources of information referenced to:

External Structures/Surface Components

ROC Posts are usually in various states of disrepair as they have been derelict for over 20 years now and as a result some features may be missing, or in a poor state or altered out of all recognition. When they are intact, however, the following features are readily identifiable. Additionally equipment that was used on the surface is also shown.

The Posts have no mains electricity, water or drainage so they were provided with chemical toilets, jerry cans for water and 12v lead acid batteries and a petrol generator for charging them. All the lighting was very basic, originally consisting of a single 12v 3w bulb above the main desk. The posts were later upgraded to include an 11w striplight which gave a lot more light. Many crews added additional lights at the sacrifice of battery life as no thought was given to illuminating the shaft or toilet! The lighting systems worked on a timer circuit to ensure the lights couldnt be inadvertently left on when the post was unattended.

Torches and candles were used to provide supplemental lights and the equipment was either designed to not need batteries (the BPI), to be powered from the post batteries (Radio and lights), powered by internal ‘D’ cell 1.5v batteries (the FSM and torches) or powered by 50v coming in over the telephone line from the BT exchanges (Teletalk and WB1400 warning system). In the early days the 50v provided by the BT lines was not available so posts were provided with large 50v dry batteries to power the early versions of the comms equipment.

Food consisted of military ration packs that could be eaten cold or heated up with the solid fuel cookers – although policy at the time was not to use the cookers inside the post! However many crews provided their own commercial gas cookers and more palatable food.

Click each photo to view enlarged pictures of various items in a new window.

Entry Hatch – attached to the side is a ventilation shaft

Entry Hatch

Second ventilation stack – to facilitate air circulation in conjunction with the entry hatch vent. The aerial for the radio at Master posts was attached to the side of this. The black top hat is the cover for the aerial connections.

Vent Shaft and radio ‘top hat’ connector cover

Fixed Survey Meter (FSM) Tube – large pipe with a bolted cover – for the external components of the FSM (Radiation monitoring instrument). The external components formed a polycarbonate dome to provide weather shielding for the radiation detector probe.

Fixed Survey Meter (FSM) Tube
FSM Polycarbonate cover dome

Bomb Power Indicator (BPI) Tube – small pipe approx one inch diameter – for the external components of the BPI (measures nuclear bomb size and power)

Bomb Power Indicator (BPI) baffle plate

Ground Zero Indicator Mount – usually on the entry hatch but sometimes on the ventilation stack depending on local circumstances – for mounting the GZI on, to enable triangulation of ground zero of the explosion. Many thanks to Gilbertfield Post for the use of their photo of a GZI.

Ground Zero Indicator (GZI) mount
Ground Zero Indicator (GZI)

Other equipment also used on the surface was the petrol electric set for charging the posts batteries.

Petrol Electric Generator set for charging post batteries
Petrol Electric Set in situ

In addition you may find various plates and mounts in the floor. These are for the mounting, earthing and guying out of the radio aerial at Master posts.

Earthing Point for aerial
Guying point for aerial

Now, enough of the surface lets head underground for a look around, click the photo.


Modified: 27th Dec 2017